That 250 A breaker is NOT rated for exposure to the elements, and it is sensitive to its orientation. It would need to be enclosed in a "Rain tight" enclosure ... probably something that you do not want to deal with.

The size of the wires, however, will be the same as aluminum wires, 2 or 3 AWG. Is 150 amp service enough? The wire size for copper doesn't change much because copper can handle loads of electricity in smaller gauges without getting heated up. Although the answers above about circuit breakers are 100% correct -- anything over 60A I go with physical fuses ... the reasoning is that fuses have no mechanical parts - they are typically made to extreme tolerances and those tolerances are easy to replicate by the manufacture ... so a 200A physical fuse will normally blow at 200A ... For Circuit Breakers i have seen 60A blow anywhere between 52 and 66 -- at 52 it was a nuisance -- at 66 you start smelling the cable .... NOT saying that they are all that way -- stricter tolerance manufacturers have higher tolerances -- but in this day and age of everybody getting there stuff manufacturers in China is it worth the risk??In the past, the answer to this question was dictated by the NEC. Their regulations said that the number of circuit breakers couldn’t exceed 42. Butthat rule was removed in 2008. Today, the NEC expects you to listen to the manufacturer. The data the manufacturer prints on the panel door (inside) will tell you the number of circuit breakers their 150-Amp panel can contain. How Much Does A 150-Amp Service Cost? Use the electrical disconnect to shut down the main power and call an electrician to fix the situation. There is also the cost of a permit and the subsequent inspections. Don’t skip this part of the process in trying to save time and money. It may be what keeps your home safe from fire. New Electrical Panel Costs

In the Midnite combiner boxes, fuses take up more room that circuit breakers.... their box that holds three breakers can only hold two fuses. Their box that holds six breakers can only hold four fuses, etc. And, regarding the adequacy of the 150 A breaker and perhaps smaller gauge wire, much of this depends upon the cable length. In some cases, a new panel will cost less than an upgrade because a new construction installation is open (no drywall to open), the wires are new (no wires to update), the panel is new, and everything goes together much faster than digging through an older installation. AFCI vs. GFCI BreakersI have no real expertise regarding circuit breakers. I read this thread because I was about to make my own thread regarding circuit breakers.

If you can't find the battery/inverter cable you are looking for, you can always go to a battery retailer where they sell and install batteries like interstate, that's where I had mine custom made. Like other electric services, you need a rigid conduit (minimum size of 1-1/4 inches), a service entrance wire (minimum rating of 100 amperes for a single-family setting), service disconnect means of less than 100 Amperes (3 wire), and 6AWG copper conductors and 4 AWG aluminium conductors where bonding is required.If you have read so far, you have come across some wire material types, copper, aluminum, and copper-clad aluminum. Tools and equipment – Electricians already have the best tools and everything they need to do the job.